cram vs bone up

cram and bone up both are verbs.

Word	Noun	Adjective	Verb	Adverb
cram	No	No	Yes	No
bone up	No	No	Yes	No

As verbs, cram and bone up are synonyms defined as:

Other synonyms of cram include bone, drum, get up, grind away, mug up, swot, swot up.

cram (verb)	bone up (verb)
prepare (students) hastily for an impending exam	study intensively, as before an exam
study intensively, as before an exam
crowd or pack to capacity
put something somewhere so that the space is completely filled